NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-12-09 T11:09:36 PST
Help | Comment | NED Home

For refcode 1999ApJ...511...56K:
Retrieve 2 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1999ApJ...511...56K Magnetization of the Intergalactic Medium by Primeval Galaxies PHILIPP P. KRONBERG Department of Astronomy, University of Toronto, 60 St. George Street, Toronto, Canada AND HARALD LESCH AND ULRICH HOPP Universitats-Sternwarte Munchen, Scheinerstrasse 1, D-81679 Munchen, Germany Received 1998 May 4; accepted 1998 August 25 ABSTRACT We review what has recently been learned from starburst-driven "superwinds," galaxy-scale outflows, dwarf galaxy surveys, and evidence for early-universe merging scenarios. We apply this knowledge to simplified model populations of dwarf galaxies in the primeval galaxy era to demonstrate how a substantial fraction of the intergalactic medium can be permeated with magnetic fields by dwarf galaxy outflow winds in the "volcanic early universe." Mechanisms of both magnetic field regeneration and diffusion are discussed as they apply to galaxies at both primeval and later epochs of the universe. We propose that, in the past, magnetic field strengths in outflow superbubbles and halos were stronger than those now prevailing in the disks of current-epoch galaxies such as the Milky Way. We also show how subsequent a causal diffusion of magnetic fields (which we have not modeled) can propagate the fields over great distances in the universe within a Hubble time. We conclude that dwarf galaxies can effectively seed the intergalactic medium with magnetic fields for a wide range of outflow and galaxy density parameters. If the first galaxies form at or before z~10 in a "bottom-up" hierarchical merging scenario, a substantial fraction of the intergalactic medium will become permeated with a magnetic field at the present epoch. This intergalactic field seeding is largely accomplished by z~6. Subject headings: galaxies: clusters: general-galaxies: formation - galaxies: magnetic fields-intergalactic medium
Retrieve 2 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home